Rust Requires Chilkat v11.5.0+

Viewing a Simple Three-Step Execution Plan

See more CURL Examples

This example demonstrates a straightforward, valid dependency chain that results in a three-step execution plan. The goal is not to execute the requests, but to inspect how the plan is constructed using ExaminePlan.

The target curl command requires {{order_id}}. A helper function is defined to produce order_id, but it depends on customer_id. Another helper function produces customer_id, which depends on account_name.

Because account_name is provided as a known input, the dependency chain can be fully resolved:

• customer_id is obtained from account_name
• order_id is obtained from customer_id
• The target curl command uses order_id

When ExaminePlan is called, it builds and returns a three-step execution plan showing the order in which each function would be executed.

Rust

let mut success = false;

let http_curl = chilkat::HttpCurl::new();

// The target curl command requires {{order_id}}.
let target_curl = "curl -X GET https://api.example.com/orders/{{order_id}}".to_string();

// Define a helper function that produces order_id from customer_id.
let mut fn_name = "getOrderId".to_string();
let _ = http_curl.add_function(&fn_name, "curl -X GET https://api.example.com/order-id?customer={{customer_id}}");
let _ = http_curl.add_output(&fn_name, "order.id", "order_id");

// Define a helper function that produces customer_id from account_name.
fn_name = "getCustomerId".to_string();
let _ = http_curl.add_function(&fn_name, "curl -X GET https://api.example.com/customer-id?account={{account_name}}");
let _ = http_curl.add_output(&fn_name, "customer.id", "customer_id");

// Provide the starting known input.
http_curl.set_var("account_name", "acme");

// Examine the execution plan without running any requests.
let plan_json = chilkat::JsonObject::new();
plan_json.set_emit_compact(false);

success = http_curl.examine_plan(&target_curl, &plan_json).is_ok();

// Success is expected to be true.
println!("success = {}", success);

println!("{}", plan_json.emit().unwrap_or_default());

// Expected result:
// 
// {
//   "plan": [{
//     "function": "getCustomerId",
//     "inputs": ["account_name"],
//     "outputs": ["customer_id"]
//   },{
//     "function": "getOrderId",
//     "inputs": ["customer_id"],
//     "outputs": ["order_id"]
//   },{
//     "function": "targetCurl",
//     "inputs": ["order_id"],
//     "outputs": []
//   }]
// }